开发了六至七元环的串联氧化环扩展,以构建一类嵌入氧杂环己烷和硫杂环己烷的新型负弯曲多环芳烃,即二苯并[b,f]菲并[9,10- d ]氧杂环己烷( DBPO) 和二苯并[ b , f ]菲并[9,10- d ]硫杂苯 (DBPT) 分别。机理研究揭示了邻联苯连接的亚甲基呫吨的烯烃部分和邻四氢苯醌之间形成的意想不到的[4+2]环加合物充当自由基阳离子或阳离子等价物,促进FeCl 3介导的串联环膨胀过程。
Very Fast, Ligand-Free and Aerobic Protocol for the Synthesis of 4-Aryl-Substituted Triphenylamine Derivatives
作者:Chun Liu、Qijian Ni、Jieshan Qiu
DOI:10.1002/ejoc.201100072
日期:2011.6
A fast, convenient and ligand-free protocol for the synthesis of a series of 4-aryl-substituted triphenylamine derivatives by a palladium-catalysed aerobic Suzuki reaction of aryl halides with [4-(diphenylamino)phenyl]boronic acid in aqueous iPrOH is described. Importantly, both aryl bromides and heteroaryl halides afforded good to excellent yields under mild conditions.